Burner for pulverous fuel



Dec, 9, 1924- 1,518,223

5. scHoTT ET AL BURNER FOR PULVEROUS FUEL Filed July L6, 1923 Witnesses= I Inventorsv I E. schot tet Mjiaug Patented Dec. 9, 1924.

UNITED STATES PATENT OFFICE.

EHRHART SCI-IOTT AND WILHELM HAUG, F LEIMEN, NEAR HEIDELBERG, GERMANY,

ASS IGNORS TO THE PORTLAND-CEMENTWERKE HEIDELBERG-MANNHEIM- STUT'IGART, AKTIENGESELLSCHAFT, OF HEIDELBERG, GERMANY.

BURNER FOR PULVEROUS FUEL.

Application filed July 16,

T 0 all whom it may concern:

Be it known that we, EHRHART SCHOTT and VILHELM HAUG, both citizens of the German Republic, and both residing at Leimen,

near Heidelberg, Germany, -have invented certain new and useful Improvements in Burners for Pulverous Fuel, of which the following is a specification.

This invention relates to an improved burner designed for pulverous fuel, especially for coal dust. The invention has principally for its object to inject the fuel in combination with air for combustion into the fire box of the coal dust furnace in such a manner that the coal dust which is per se diflicult to ignite ignites instantaneously and that it is entirely burnt in the ignition space of the furnace within a very short time so that the slags may settle in the ignition space and are not carried along into the flues and heating chambers.

This invention has further for its object to protect the burner proper against the action of the extraordinarily high temperature in the ignition chamber of the furnace and to make the surface of the burner which is exposed to the action of this heat as small as possible. The invention has again for its object to render the combustion economical so that the furnace possesses a high efliciency.

The invention will be best understood from a consideration of the following de tailed description taken in connection with the accompanying drawings forming a part of this specification, with the understanding that while on the drawings one embodiment of the invention is disclosed, the invention is not confined to 'any strict conformity with the showing of the drawings, but may be embodied in any manner which does not make a material departure from the salient features of the invention.

In the drawings:

' Fig. '1 shows partly in plan view and partly in horizontal section a burner constructed according to the invention.

Fig. 2 shows the burner partly in side elevation and partly in vertical section,

Fig. 3 is an end view of the burner seen in the direction of the arrow as (Fig. l).

A mixture of coal dust and air for com-.

bustion is supplied to the burner by the pipe at, the, special apparatus for the pro- 1923. Serial No. 651,935.

duction of pulverous fuel and for the admission of the same to the pipe a being not shown as they are common and well known and need no further description. The mouthpiece of the burner which is coaxial with pipe a is connected with this pipe by connecting tube 6 of the same diameter as the pipe a and consists of a fan shaped part b terminating in a narrow slot-shaped exit c.- In the fan shaped part b and in the connection tube 6 several main partitions (Z are arranged. Between these main partitions cl auxiliary partitions e are arranged in the fan shaped part I). The mouth 0 of the burner is bricked into the brick work f of the ignition and combustion chamber (not shown in the drawing) so that this mouth a of the burner is flush with the inner surface 7 of the brickwork, no

part of the burner projecting into said cham- The mixture of fuel and air entering the connecting tube 6 is subdivided into several jets. As the thin sharp edges of the main partitions 01 offer no resistance to the pulverous fuel the main jets are transferred without shocks into the main channels. By the auxiliary partitionse in the main channels the main jets or currents are subdivided again without shock. In this manner the jet flowing in from the pipe a is gradually subdivided. into numerous independent currents of favorable shape which, after having flowed 'through the mouth 0 'of the burner into the ignition or combustion chamber, are instantaneously ignited and burnt completely. The whole processof the subdivision and transformation of the jet of fuel and air mixture is carried out without any appreciable loss of energy and without the possibility that the pulverous fuel is precipitated in the burner by the action of shocks. 4

The burner itself is, with the exception of the very small mouth 0, perfectly protected by the brickwork so that it can servr for a very long time.

The direction of the supply pipe a may be selected at will. The auxiliary partitions e'may also extend into the tubular connection 6' or all the partitions might terminate in the fan shaped part I).

We are aware that it has already been ing a fan like expansion and'provided with partition for dividing the burner into a plurality of channels; therefor we do not claim broadly such matter but what we claim is:

We claim In combination with a furnace having walls of brick work, a burner for pulverous fuel consisting of asupply pipe of circular cross-section for the feeding of the mixture of fuel dust and air, and of a mouth piece in coaxial connection with said supply pipe, said mouth piece-expanding from the circular cross-section of the supply pipe into a narrow slot-shaped exit at its free end and having a plurality of rnain and auxiliary partitions, the main partitions extending plurality of independent currents, the front end of said mouth piece being flush with the brick work .of the furnace.

In testimony whereof we aflix our signatures in presence of two witnesses.

DR. EHRHART SCHOTT [1,. s.'i WILHELM HAUG. 11 Vitnesses:

W.-W. SoHo'r'r,

C. C. L. B. Wms. 

